Nom

“Nom de guerre ” is French for a “war name,” but really
means an assumed name. It was customary at one time for everyone who
entered the French army to assume a name, this was especially the case
in the times of chivalry, when knights went by the device of their
shields or some other distinctive character in their armour, as the
“Red-cross Knight.”

“Nom de plume. ” English-French for the “pen name,” and
meaning the name assumed by a writer who does not choose to give his
own name to the public, as Peter Pindar, the nom de plume of Dr. John Wolcot; Peter Parley, of Mr. Goodrich, Currer
Bell, of Charlotte Brontë; Cuthbert Bede, of the Rev. Edward
Bradley, etc.